/** * Draws the background for the plot. * * @param g2 the graphics device. * @param plot the plot. * @param dataArea the area inside the axes. */ @Override public void drawBackground(Graphics2D g2, CategoryPlot plot, Rectangle2D dataArea) { float x0 = (float) dataArea.getX(); float x1 = x0 + (float) Math.abs(this.xOffset); float x3 = (float) dataArea.getMaxX(); float x2 = x3 - (float) Math.abs(this.xOffset); float y0 = (float) dataArea.getMaxY(); float y1 = y0 - (float) Math.abs(this.yOffset); float y3 = (float) dataArea.getMinY(); float y2 = y3 + (float) Math.abs(this.yOffset); GeneralPath clip = new GeneralPath(); clip.moveTo(x0, y0); clip.lineTo(x0, y2); clip.lineTo(x1, y3); clip.lineTo(x3, y3); clip.lineTo(x3, y1); clip.lineTo(x2, y0); clip.closePath(); Composite originalComposite = g2.getComposite(); g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, plot.getBackgroundAlpha())); // fill background... Paint backgroundPaint = plot.getBackgroundPaint(); if (backgroundPaint != null) { g2.setPaint(backgroundPaint); g2.fill(clip); } GeneralPath leftWall = new GeneralPath(); leftWall.moveTo(x0, y0); leftWall.lineTo(x0, y2); leftWall.lineTo(x1, y3); leftWall.lineTo(x1, y1); leftWall.closePath(); g2.setPaint(getWallPaint()); g2.fill(leftWall); GeneralPath bottomWall = new GeneralPath(); bottomWall.moveTo(x0, y0); bottomWall.lineTo(x1, y1); bottomWall.lineTo(x3, y1); bottomWall.lineTo(x2, y0); bottomWall.closePath(); g2.setPaint(getWallPaint()); g2.fill(bottomWall); // higlight the background corners... g2.setPaint(Color.lightGray); Line2D corner = new Line2D.Double(x0, y0, x1, y1); g2.draw(corner); corner.setLine(x1, y1, x1, y3); g2.draw(corner); corner.setLine(x1, y1, x3, y1); g2.draw(corner); // draw background image, if there is one... Image backgroundImage = plot.getBackgroundImage(); if (backgroundImage != null) { Rectangle2D adjusted = new Rectangle2D.Double( dataArea.getX() + getXOffset(), dataArea.getY(), dataArea.getWidth() - getXOffset(), dataArea.getHeight() - getYOffset()); plot.drawBackgroundImage(g2, adjusted); } g2.setComposite(originalComposite); }